You’ve already allocated a bunch of cash for floor anchors & motorcycle-grade padlocks & chains?
Neighbours recently had a run of garage break-ins. First one took >£4000 of bikes and power tools. All locked reasonably well. Then they had a break-in that took the remaining bikes. Then they had one that just broke in – nothing left to steal. They now have a ‘drug-dealer’ type boxed steel door on the garage and have bolted the up & over door into the frame. It sucks.
Makes my not so recent garage break-in relatively light. Only a couple of (nice) bikes, lights, and a couple of garden power tools. I’ve doubled down on floor anchors, padlocks and chains, and moved extra valuable items elsewhere. Oh and added digital CCTV.